Calculator



' 45 17 and slidably Patented May 27, 1924.

UNITED STATES PATENT oFFlcE.

MARK LAMPIAN PIKE, F

mNNEso'ra.

ST. PAUL, MINNESOTA, CHARLES F. TIEDM'AN AND ONE-THIRD T0 RICHARD ERICKSON, BOTH 0F ST. PAUL,

ASSIGNOR OF ONE-THIRD TO CALCULATOR.

Application led June 15, .1922. Serial No. 568,364.

To all whom it. may concern.'

Be it known that I, MARK LAMPMA'N PIKE, a citizen of the United States, residing at St. Paul, in the county of Ramsey and State of Minnesota, have invented a new and useful Calculator, of which the following is a specification.

My 'invention relates to improvements in calculators.

Its object is to provide a. simple and ellicient device adapted particularly, though not exclusively, for quickly and easily computing amounts representing wages at different scales for dili'erent periods of time.

With the foregoing and other objects in view, which will appear in the following description, -the invention resides in the novel combination and arrangement of parts and in the details of lconstruction hereinafter described 'and claimed.

In the drawings, Figs. 1 and 2 are plan views of a device embodymg my'inventiom' the slide-rest and the slide being shown in different positions; Fig. 3 isa sectional view taken on the line'3-3 of Fig. 1 and Fig. 4 is a similar view taken on the line 4 4 of Flg. 1.

drawings, 10 indicates Referring to the a table having grooves 11 in its longitudinal edges and va scheduleI on the face thereof eonsistin of columns of numbers A and B.

A frame traversing the table 10, includes a air of blocks 12, one foreach sideof the ta le, each block having a tongue 13 formed thereon and ada ted to slide in agroove 11 in said table. aidframe also includes a slide-rest 14, which is secured at its ends to the blocks` 12. The frame Xis equipped with a fixed indicator and movable indi- 49 cator, the former comprising a window 15 in said frame, said window being designed to register singly with the numbers in the column A. lThe movable indicator comprises a slide 16 fitted with beveled edges retained thereby in a way 18 in the slide-rest 14, said slide being 4formed with a window 19 designed to register singly with the numbers in .each of the columns of figures B. A slot 2O in the slide 16 and a slot 21 in the slide-rest 14 register respectively with the windows 15 and 19 in all of the operative positions of said slide 16. The numbers inthe column A represent periods of time progressing by half hours from top to bottom of said column, the letters hrs appearing on the slide-rest 14, as at 22, and in line with said designate the same Each number in each being arranged in line with its respectivecolumn of figures B. The numbers in the columns A and B are arranged with respect to each other so that when a certain number, indicative of time, is visible throu h the window 15, a number indicative of t e amount payable will be visible through the window 19, following the alignment of said windowwith the guide g indicating the rate upon which the amount payable is based. Thus, as in Fig.l 1, three hours, (the figure 3 being visible through window 15) at 40 per hour amounts to one dollar and twenty cents (1.20 being visible throu h the window V19). Also, as in Fig. 2, ve hours at ninety cents per. hour amounts to four dollarsfand fifty cents, the number 5 being visible through the window 15 and the number `4.50 visible through the window 19, said window 19 being aligned with the guide g representing the ninety cent scale.

he numbers or multipliers in the col-` umn A ma'y re resent pieces, the guides g or multiplican s, rates perl piece and the numbers or products 1n the columns B amounts payable for given numbers of pieces at given rates per piece Thus it will be observed that my improved calculator is not confined to single class computations.

Aside from its simplicity, the speed and ease ofoperation of my improved device will be apparent.

amount payable at a' It will be understood that the table 10 i maybe in the form of a cylinder or disk and that other changes in the specific form of my invention, as shown, may 'be made Within the scope of what is claimed without departing from the spirit of my invention. 3

Havingdescribed my invention, what I one bei movable with movable with respect claim as new and desire to protect by Letters Patent is:

1. In a calculator, a table and a frame,

respect to the other, said tab e bearing series of symbols, an indicator associated with said frame and adapted to selectively .indicate each symbol of one of said series, and a second indicator to said frame and adapted to selectively indicate each symbol of each of the other series relating to the selected symbol of said first series.

2. In a calculator, a table, a slide-rest mounted on said table and adapted to move longitudinally thereof, said table bearing a series of symbols indicative of multipliers and other series o symbols indicative of products, said slide-rest having s Inbols thereon indicative ot multiplican s and` also having a Window therein adapted to be selectively registered with each multiplier, and a slide on the slide-rest having a window therein adapted to be selectively memes 'a table and slide-rest, respect to the other,

ysaid table bearing a series o symbols indicative of multipliers Vand other series of symbols indicative of roducts, said slideresthaving symbols t ereon indicative of multiplicands, an indicator associated with the slide-rest and adapted tc loe selectively positioned with respect to each multiplier, a slide on the slide-rest, an indicator associated with said slide and adapted to be selectively positioned with respect to each multiplicand and to designate the symbol indicative of the product of the selected multiplier and multiplicand.

In testimony whereof, l have signed my name to this specification,

MARK LMPMAN PEKE. 

